java 不运行,Java IllegalAccessError无法运行应用程序

I'm setting up my first program for a class and I'm stuck on why my program won't run trying to debug. What do I need to do to debug this error?

I've tried to add libraries but this didn't seem to work.

import javafx.event.ActionEvent;

import javafx.event.EventHandler;

import javafx.scene.Parent;

import javafx.scene.Scene;

import java.io.IOException;

import javafx.fxml.FXMLLoader;

import javafx.scene.control.Button;

import javafx.scene.layout.StackPane;

import javafx.stage.Stage;

import java.awt.*;

public class Main extends Application {

@Override

public void start(Stage primaryStage) {

try{

Parent root = FXMLLoader.load(getClass().getResource("Sample.fxml"));

primaryStage.setTitle("My First J